Landmark and elevation cap for setting in concrete.



C. A. 6L A. L HANSON.

v LANDMARK AND ELEVATION CAP FOR SETTING IN CONCRETE.

v APPLICATION FILED JUNE 8.19r7. 1,272,430.

Patented J uly 16, 1918.

CHARLES A. I-IANSON AND ALBERT L. HANSON, OF MUNISING, MICHIGAN.

LANDMARK AND ELEVATION CAP FOR SETTING IN CONCRETE.

Specification of Letters Patent.

Patented July 16, 1918.

Application led .Tune 8, 1917. Serial No. 173,498.

To all 'whom it may concern:

Be it known that we7 CHARLES A. HAN- soN and ALBERT L. HANsoN, citizens of the United States, residing at Munising, in the county of Alger and State of Michigan, have jointly invented a new and useful Improvement in Landmark and Elevation Caps for Setting in Concrete, of which the following is a specification.

The object of our invention is to Yprovide an improved landmark and elevation cap in such form that the device may be set in concrete in instances where engineers desire to establish concrete corners. It is further our object to provide a perforated cap shaft milled on the slant so that when the concrete has firmly set it is impossible to move it without complete destruction of the concrete base. It is further our object to provide an elevation cap having a novel proj ection on the top wherebythe costv of :manufacture is reduced and several advantages obtained over the usual flat surface. We attain the objects of our invention by the mechanism illustrated in the accompanying drawings in which- Figure 1 is a perspective of the invention embedded in a concrete post; Fig. 2 is a Avertical section; Fig. 3 is a horizontal section on line 3 3 of Fig. 2; and Fig. 4 isa perspective of an elevation cap before it is set in concrete.

Like numerals designate throughout the views.

Referring to the accompanying drawings Fig. 1 illustrates our-improved landmark cap set in a suitable concrete post 8.l Cap member 4 is provided with a circular projection presenting a fiat raised surface in the form of a disk 5 in the center of the top of the cap, obviating the close milling necessary if the entire top surface of the cap is flat andvthus effecting a material saving in the cost of manufacture of the cap, which is made from brass. 6 designates the side of the .n projection. 7 designates the direclike parts tion markings Von the landmark cap. l

f designates the cap shaft, which is provided with openings 2 having slanting or downwardly inclined sides 3, as shown in Fig. 4. In operation the cap is embedded in a Copies of this patent may be obtained for suitable concrete base 8. rlhe concrete firmly sets within and around the cap shaft filling the openings 2, so that it is impossible to move the cap without complete destruction of the concrete base. The side openings 3 are narrower at the base than at the top. This is so that when the concrete has fully filled the openings in the cap shaft and the cap set thereby, there will be a pressure eX- erted by the concrete on the opposite slanting sides of the cap shaft openings as well as at the base of the opening if an attempt is made to lift the 'cap or otherwise tamper with it. v

The projection or raised center 5 is a desirable improvement because it makes a smaller surface upon which to stand a level.- ing rod, and at the same time obviates the close milling necessary when the entire surface is fiat. `An important economy in the manufacture of elevation caps is thus effected. rlhe raised projection 5 is of great advantage because should the cap be turned so as to throw it from an exact level, the difference between the lower and upper edges would be eXtreme while the center would be the mean and the variation consequently very small.

'What we claim is:

l. A permanent metal landmark cap consisting of a cap of circular form having a flat upwardly projecting disk on its central upper portion, a hollow cap shaft extending ldownwardly from the cap, said shaft havv ing openings, the openings being narrower at the bottom than at the top to permit of the cap being firmly embedded in a concrete base, whereby it would be impossible to move it without complete destruction of the concrete base. f

2. In combination with a concrete base, an elevation and landmark cap having a metal cap shaft embedded in the concrete, said shaft having openings the'sides of which are milled on the slant to prevent tampering withthe cap after ther-concrete has rmly setV within and around the cap shaft without complete destruction of the concrete base.

CHARLES A. HANSON. ALBERT L. HANSON.

five centsceaeh, by addressing the Commissioner of Patents. Washington, D. C. 

